Mold for reenforced concrete stadiums



Aug. 25, 1936. w. A. CANNON 2,052,445

4 l MOLD FR REENFAORCED CONCRETE-S'1VADIUMS Filed July'le, 1934 PatentedAug. 25, 1936 gaat Auitrit-:D STATES TENT OFFICE MOLD FoaREENFoRcEuVooNeRETE sTAmUMs, v

Will Alban Cannon, Niagara Falls, N. Y.

Application July 19, 41934, serial No. 736,199 1 claim. (c1. 25;-1187)This invention relates to certain new and useful improvements in moldsfor reenforced concrete stadiums, and of the general character disclosedin the patent granted to Will Alban Cannon on July 3, 1934, PatentNumber 1,965,486.

The present invention has particular reference to-a removable mold forthe tread of a reinforced ooncrete stadium and also a nosing stripv thatis separated from the forward edge of the tread after the setting of theconcrete thereof.

A further object of the invention is to provide amold of the foregoingcharacter that is formed of inter-fitting sections detachably engagedwith metallic risers with the latter arranged in stepped formation withthe head of one riser substantially in the plane ofthe foot of anadjacent riser, the' molds or forms being retained in position by bracerods and clips that are readily removable to facilitate removal of themolds or forms after the concrete treads are set.

With the above and other objects in view that i will become apparent asthe nature of the invention is better understood, the same consists inthe novel form, combination and arrangement of parts hereinafter morefully described, shown in the accompanying drawing and claimed.

Figure l is a fragmentary sectional .View showing molds or formssupporting the plastic treads of a reenforced concrete stadium with thedevices for holding the molds or forms in position;

Figure-2 is a fragmentary top plan view showing one mold in position anda second mold angularly disposed or tilted during placement forinter-fitting engagement with the set molds;

Figure 3 is a top plan View of one of the molds or forms showing cutaway corners at one end thereof to escape head and base flanges ofadjacent metallic risers to permit placement of the mold or form intread supporting position;

Figure 4 is a fragmentary plan view of Vthe nosing strip for the forwardedge of the tread; and

Figure 5 is a detail sectional View showing the inter-fitting connectionbetween adjacent ends of the molds or forms.

The mold or form is designed for supporting the concrete tread when laidin a plastic condition as set forth in the patent hereinbefore referredto and as disclosed herein, the stadium including I-beams I0constituting metallic risers and arranged in step formation as shown inFig. 1, each I-beam comprising a web II, a head cornprising flanges I2and I3 and a foot comprising flanges I4 and I5. The risers are connectedby means Vof. tieA rods I6, each tie rod being connected atcorresponding ends to the web I I of an I-beam adjacent the base flangesIll and I5 and threaded for the reception of nuts I'I at opposite sidesof the flanges while the opposite ends of 5 each tie rod are angularlybent downwardly as at I8 for passage through the head fiange I2 and isthreaded for the reception of a nut I9 at each side of the head flangefor clamping the tie rods infposition.' By adjusting the nuts I'I l0-and I9, any irregularity or distortion in the I beams I il are removedand the I-beams are placed in absolute parallelism.

- The mold or form is illustrated in Figure 3 and'being designated ingeneral by the reference 15 character 2l) comprises a pair of cross-bars2l and 22 arranged in` spaced relation and to which a plurality ofpanels or boards 23 are permanently secured as at 24, it beingunderstood however that a single plate construction may be 20 employedin lieu. of the separate panels or boards 23. As shown more clearly inFigure 3, the cross bars 2l and 22 extend laterally or outwardly of theopposite sides of the panels or boards 23 as sho-wn at 25 and 26. Theends 23a 25 of the panels 23 project beyond the adjacent side edge ofthe cross-bar 2l to provide an overhanging ledge while the other ends23h of the panels terminate in spaced relation to an edge of the crossbar 22 to provide a ledge 22a. The 30 opposite collars of theoverhanging ledge 23a are cut away as at 2l to provide angle shoulders28 and 2g.

A mold or form is first placed into position as illustrated in` Figure 1with the panels 23 35 disposed beneath a head flange I3 and a baseflange I in spaced relation tol the webs II of the: rise-rs, theprojecting ends 25 of the cross bars 2| and 22 engaging the webs IIwhile the projecting ends 26 terminate substantially in the 40 planes ofthe outer edges of the base flanges I5. When so disposed, U-shaped clips33 are engaged with the base flanges I5 and cross bar ends 26 whilestruts or brace bars 3I are wedged into position between the baseflanges I5 and the 45 molds as shown in Figure 1.

The succeeding molds are then placed in position, and as shown in Figure2, the second mold is inclined or tilted to position the side shoulders28 of the out away portions 21 for engagement 50 with the adjacent sideedges of the head ange I2 and base flange I4 while the shoulders 29 areengaged with the undersides of said flanges to pivot thereon when thelower end of the mold is elevated for positioning the overhanging ledge5 23a of the mold onto the ledge 22a of the previously set mold, andwhen this second mold is in position, the same is so retained by meansof the brace bars or struts 3i and the U-shaped clips 30, eachsucceeding mold section being similarly placed in position. The cut awaycorners 21 at one end of the mold permit the intertting engagementbetween adjacent ends of the molds as shown in Figure 5.

The nosing strip 32 shown in detail in Figure 4 in the form of anelongated bar carries at one side edge thereof laterally projectingbifurcated cleats 33 that are received on the angle ends I8 of the tierods I6 below the head flanges I2 that are retained in position by theadjacent nut I9. in Figure l is then placed onfthe tierods I6 andconcrete 35 poured onto the mold to embed the tie rods and metallicreenforce 34, the concrete being confined by the web II of a riser andthe nosing strip 32, The upper surface of the concrete tread 34 issuitably inclined for drainage purposes to facilitate cleaning of thestadium. After the concrete treads are set, nosing strips 32 are removedby loosening the lower nut I9 to permit disengagement of the cleats 33therewith, the nut being thereafter tightened and the forms 20 areremoved. To remove the forms, the strut braces 3I are knocked out ofposition and the clips 33 disengaged from the base flanges I5 and crossbar extensions 26 and should the molds adhere to the lower face of theconcrete, they may be readily pried therefrom by a downward pull on theprojecting ends 25 and 26 of the cross bars. It is to be noted that theplacement of all forms is accomplished at a point above the I-beams andscaifolding or erection of sub- A metallic reenforcing element 34 asshown structures are not required. The building and knocking down of theforms is thus greatly facilitated as all work in connection with theforms is performed from above.

From the above detailed description of the invention, it is believedthat the construction and operation thereof will at once be apparent,and While there is herein shown and described the preferred embodimentof the invention, it is nevertheless to be understood that minor changesmay be made therein without departing from the spirit and scope of theinvention as claimed.

I claim:-

In a mold for reenforced concrete stadiums, wherein the stadium embodiesmetallic risers of I-beam formation and concrete treads, a mold for theconcrete tread engageable with the undersides of the head and base angesof adjacent risers, an intertting connection between adja cent molds,one mold end at the connection being cut-away at the corners thereof toclear the adjacent edges of the riser flanges during placement of themolds in intertting engagement, each mold including cross bars extendingoutwardly of the side edges thereof and spaced from the I-beain flangeswhen in position, the crossbars being arranged adjacent the ends of themolds for limiting the intertting connection therebetween, clampingmeans engaged with the base flange and adjacent cross-bar extensions atone side of the mold and adapted toI flex the extensions for moreintimate contact of the mold with the I-beam flanges and brace rodsextending between the other side of the moldrand adjacent lower baseflange.

WILL ALBAN CANNON.

